Fluke PG9000 Series, Operation And Maintenance Manual

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3. GENERAL OPERATION
Page 101 © 2011 Fluke Calibration
Note
In systems using fluid interfaces, the head fluid selected should
be the medium used that separates the PG9000 reference level
from the device under test.
3.12.3.2 <3head>, <2unit>

OPERATION
To specify the DUT and ATM head
height unit (see Section 3.12.3,
PRINCIPLE), press
[SPECIAL] and
select <3head> , <2unit> . The display is:
Head height unit:
1in 2cm
Selecting the desired unit returns to the previous run screen with that unit active
for the DUT and ATM head function heights.
3.12.3.3 <3head>, <3atm>

OPERATION
To specify the ATM head height (see
Section 3.12.3, PRINCIPLE), press
[SPECIAL] and select <3head> ,
<3atm> . The display is:
Edit ATM head unit:
-17.30 cm
Entering the ATM head returns to the previous run screen with the new height active.
The correct head height when using the PG9000 internal barometer is the
distance from the reference level of the PG base (laser mark on the mounting
post) to the mid line of the barometer in the Remote Electronics Module (see
Section 3.11). If the Base and REM are on the same surface and the REM is
horizontal, the distance is -17.3 cm for PG9602. The default value of -10 cm
must be edited to reflect the actual distance used with the PG9602.
Note
•
The ATM head height is negative if the barometer is below
the PG9000 reference level and positive if the barometer is
above the reference level. The ATM head fluid is air and it
cannot be changed. The ATM head height unit is set by
pressing [SPECIAL] and selecting <3head>, <2unit>.
•
The default ATM head height is -10.0 cm! This value must be
edited prior to using the PG9602 in order to minimize error.
3.12.3.4 <3head>, <4piston>

OPERATION
To turn the PISTON head correction function ON and OFF (see Section 3.12.3,
PRINCIPLE), press
[SPECIAL] and select <3head> , <4piston> .
Select <1on> to turn the PISTON head correction function ON so that a head
correction for piston position IS automatically applied.
Select <2off> to turn the PISTON head correction function OFF so that a head
correction for piston position IS NOT applied.
Note
The PISTON head is automatically turned OFF (has no effect) in
gauge or differential measurement mode when the set pressure is
zero (system vented or bypassed). When the system is vented or
bypassed, the piston position no longer affects the head.